Scotch block



Jan. 22, 1952 .1. c. DOCKERY ET Al. 2,582,970

scoTcH BLOCK Filed May 11, 1949 3 sheets-sheet 1 A TTOP/VE Y- J. C. DOCKERY ET AL Jan. 22, 1952 SCOTCH BLOCK 5 Sheets-Sheet 3 Filed May 1l, 1949 /V/CHOLAS NV Docks/ZY Joy C DOCKERY 'INVENToRs A T TOR/VE K Patented Jan. 22, .1952

UNITED PATENT OFFICE rhis invention relates to an improved wheel stop of the type adapted to beplaced on .a lrail to stop the movement of aArailway-car when the wheels of the car engage the stop, and yis coinmonly known as a scotch block.

Heretofore, scotch blocks of this type .have comprised a Yvertic'zal `plate disposed on top of 'a rail in the same vertical plane as 'the 4rail and having depending centering V'rrieibers vsecured thereto and extending dlownwardlytherefrol at an angle between 'the lcross ties. This type of scotch block also has va yoke member depending from the vertical block and rigidly secured thereto, and having its lower jhr'Zntal @dition extending beneath the Vrail and `engaging "the lower `surface of the rail f'or securing the block to the ra'il. y Y

In this old Ytype of scotch block, when the yoke member is secured in proper poi'tion the 'depende ing members abut against fa cross tie fand the scotch block is in a relatively stationary position and the full impact of 'the whe'elli's absorbed Zbjy the cross tie with a severe rjolt which very Seiten loosens the scotch block and damages Ith'e cis's tie.

n is therefore the 'primary' .ob-ietf ci this ifrvention to provide a scotch "blot avlng c ampe ing means thereon Vconrleci'fed 'by camlheansfto the yoke member 'whereby upfo'n impact of the car wheel the cam means :will cause the Ablock to be tightened agains'tthe rail fand filiithei,iin-k pacts against the Vblock will 'tend 'to .further tighten the Ysame against the rail to thereby 'in-v sure a positive stop although the device is used repeatedly.

It is another object o f this invention to provide a scotch Vblock having lam'ctivatedclampging means thereunto tighten the'hlock against the rail Vupon impact of a car wheel whereby. apen such impact, 'force will'be exerted siibstantially downwardly and willie absorbed by the rail and cross tie and the ballast and 'notlbythe cross tie alone.

Itis another object of this invention tl'prvide a scotch block that Amay Vbe readily 'applied rails of different sizes or gauges 'and 'whiclim'ay he Aconstructed both simply and economically.

It is still another object of A'this invention 'to provide a scotch block that may be Jsecured 'to a rail without drilling the rail or the block of 'the cross tie as has heretofore 'been necessary some instances.

It is a further object of this inventioto 15 vide a scotch block having" a"yoke'illeri'ibei*y u latably connected 'theretoand extending-ben the Vbase of a railroad rail and to provide cam :means actuated by the yoke member so that im- -pact of a car Wheel'will cause the upper portion `nf fthe yoke to oscillate slightly in the block to v:cause the lower portion ,of the yoke to t tightly #against the base of the rail thus tightening the block against the top surface of the rail.

It is a further object of this inventionto provide a scotchgblock having anfarcuate slot which is -slidably penetrated by a shaft, opposed ends of which are connected to the upper -endsnof a zUshapedyoke member. The lower portion ,of the yoke member extends beneath the base of a rail. v'Arms are pivotally connected to ac'am -wheel oscillatably mounted in the scotch block landtlfre cam wheel vhas an eccentrically located shaft fixed therein to which` the uppenends of Lclanlping members are connected, the lower en ds of the clamping Anfiembersbeing adapted to en; `gage the llower surfaces of the upper iiange of the rail. I Y

It is afurther object of this invention toprov vide -aiscotch block which may be secured to .the upper l-surface of a rail, without the necessity of any means extending beneath the rail, and having clamping means thereongfor engaging the ,lower A surfaces of the head portions offthe rail Ato isecure the block on the rail, the clamping means .being provided with cam .means whereby impactof a wheel against the vblock will tend to itightenthe block against the rail.

Sonie ofthe objects of the invention .having been stated, other objects will .appear as the .description proceeds, when taken in connection with .the `accompanyingy drawings, in which- 4ligure 1 is a top plan view of the improved scotch Yblock mounted on a rail;`

.-'g're 2 is A a side elevation` of 'the block mounted'on fa rail and showing a portion of ,a .c'ar -wheel abutting against the face of the block;

n Figir'e f3 isa vertical sectional view .taken substantially along the 'line 3 3 in Figure l2;

iglre vl is a lfragmentary side View with parts in gseot'ion with parts broken away and show in "the c'an action associated with the `clamp-- ing means and is taken substantialy along the 'line 4-`4 in'Fig-'l'e 3;

'.Ei'gnre "6 -is an isometric View of a scotch block shbwing a jmodiii'ed forni of yoke for aetnating the cani to which the clamping means fis con'- nect'ed:

Figre AY7 -is a vertical sectional View of fthe `s'cot'chibloekincorporating the modied form of yoke and istaken substantially along the line -l in Figure 6;

Figure 8 is an enlarged vertical sectional view front or left-hand portion, in Figures 1 and 2,'1 of the plate I is curved substantially in the shape of the periphery of a car'wheel, as atl3.-`

and is adapted to be engaged by a car"wheel shown at I4 in Figure 2. Thelplate` IIextends upwardly a distance sumcient to prevent the car` wheel I4 from overrunning the plate andv is.

shown of a height substantially equal to the fradius of the car wheel. In order to prevent the impact of a car wheel from upsetting the block 'I9 the plate II has a rearwardly extending portion I5 which gives greater length to the plate land provides'for a greater base surface resting `on the rail I2. An arcuate slot I6 is cut in the plate I I so that itsrcurvature is the reverse of the 'plate face I3.

The rail I2 is conventional and may be of any size and comprises a head portion I8, a medial portion I9, and a base portion 28, and is secured by conventional spikes-2l to suitable cross ties 22, only one of which is shown.

` Now, in order to secure the block to the rail, a yoke member and cam activated clamping means are mounted on the plate II by means of shafts and rocker arms to be presently described. LThe plate II has a bore 24 therein in which a cam wheel 25 is oscillatably mounted, said cam wheel being of substantially the same thickness as the plate II. Slidably penetrating the-'cam wheel 25 is a cam shaft 26 which extends through the cam wheel 25 at a point off center its axis and when properly positioned, as Ain Figure 2, is seen to be positioned to the rear l"or right-hand side of the cam wheel 25.

* Rocker arms 2'I and 28 are disposed one on each side of the plate II and their right-hand yends in Figure 2 are penetrated by the cam shaft 26 to which they are xedly secured by welding. The rocker arms 2l and 28 are also fixedly secured jto the cam wheel 25 as by welding and may be integral therewith, if desired, so the rocker arms 21 and 28, the cam wheel 25 and the cam shaft 28 will move in xed relation to each other.

A horizontally disposed shaft 30 extends through the slot I6 in the plate II and is adapted for sliding movement therein. The shaft 30 also slidably penetrate the left-hand ends in Figures 1 and 2 of the rocker arms 21 and 28. The shaft 30 extends a distance on each side of the plate outside of the vertically projected plane of the rail I2 and has vertically disposed bores 3| and 32 in opposed ends thereof through which 35 in a position so that its base 38 extends underneath the rail I2 and its arms 35 and 31 extend upwardly, and then placing the block on the rail so the arms 36 and 31 penetrate the shaft 30, and then tightening the nuts 39 and 39' against the shaft 3B to thus press the shaft 30 against the bottom of the slot I6 and to hold the plate II against the rail I2.

Now, to further assist in securing the plate II tothe ra ilI2 and to preventsliding movement of the scotch block IIJ on the rail I2, depending clamping members and 4I are oscillatably and slidably mounted on the cam shaft 26 and Vdepend downwardly therefrom on opposed sides ofthe plate II.v The clamping members 40 and "4I 'are-provided with over-sized bores 40' and 4E "respectively, as shown in Figure 3, which are .loosely penetrated by the shaft 28 so the memythe upper ends of a substantially U-shaped yoke member or bracket 35 slidably extend. The yoke member 35 has vertically disposed arms 36 and 31 to which opposed ends of a horizontally disposed base 38 are welded. The arms 36 and 31 extend through the bores 32 and 3|, respectively, of the shaft 30 and are threaded at their upper ends for the reception of suitable nuts 39 and 39'. l It is thus seen that the plate I I may be secured to the rail I2 by first placing the yokeV member bers 40 and 4I may be swung outwardly relative't the web I9 of the rail I2 in removing the ,same from the rail as will be later described.

Thelower portions of the clamping members 40 'and 4I have flanges 42 and 43 secured, as by welding, to their inner sides. These flange por- 'tions 42 and 43 may be cast integrally with the clamping members 40 and 4I, respectively, if so desired. The clamping members 4I] and 4I extend downwardly to a point below the head portion I8 of the rail I2 and the flange portions 42 and 43 are adapted to t under the head portion I8 of the rail I2 and serve to clamp the block to the rail.

The cam shaft 26 is further connected to the yshaft 30 by means of arms 45 and 46 which extend in a substantially horizontal plane on opposed sides of the plate II and are fixedly secured at their right-hand ends in Figures 1 and 2 `to said shaft 26 by welding or a pressed lit. The left-hand ends of the arms 45 and 46 are slidably penetrated by the shaft 3D.

' vNow, in order to provide a means whereby the clamping members 40 and 4I may be placed in proper position against the rail I2, wedging members 58 and 5I are disposed on opposed sides of the plate I I. The wedging members and 5I are substantially rectangular inv shape and are nloosely penetrated at their left-hand ends in Fig- .ures 1 and 2 by the shaft 30 so the wedging members 5E! and 5I may freely pivot upon the shaft 3D. The wedging members 5I) and 5I normally extend horizontally to a point past the cam shaft ,26 and past the right-hand ends of the rocker arms 21, 28, 45 and 46. The wedging members 50 and 5I are each provided with a notch 52, only one of which is shown in the member 5I] in Figvure 2. These notches 52 are of a size somewhat .larger than the diameter of the cam shaft 26 and their surfaces nearest the shaft 30 are cut at an angle, as at 52. The notches 52 thus pro- Ivide another surface 49 which is beveled as at 49 so when the wedging members 50 and 5I are fdriven into place the notches 52 will fit over the camshaft 26. The lower portions of the surfaces 52. of the wedging members 5I) and 5I are beveled as at 53 and 54, respectively, as best seen in Figjurel3. The beveled surfaces 49 and 53 and 54 are provided for easy insertion of the wedge members 50 and 5I between the members 45 and 40 and 46 and 4 I, respectively.

'1; It is thus seen that when the block is to be placed on a rail the wedging members 58 and 5I will'be in the raised dotted line position shown inFigure 2. 'I'he clamping means 48 and 4I are then moved adjacent the arms 45 and 125 so that when the block IIJ is placed upon the rail I2, the

driven between the clamping members 40 and 4I and the arms 45 and 46 to the solid line position shown in Figure l'2 to thus tightly secure the clamping members 4u and 4I .against the rail I2.

It should be further noted that 'the scotch` block I0, as described, may be used on rails or d'iiierent sizes by driving the it/edging members 50 'and 5I a greater or lesser distance between the elainpingl members 4u and 4| and the arms 45 and 16.

Suitable collars 55 and 56 fit around the shaft 'i 35 and are welded thereto as at 51 and 58. These collars 55 and 5E are of a width Substantially the same as the upper portions of the clamping' members 4i) and 4I and serve to hold the w'edgingmembers e and 5I in proper spaced relation to 1 the plate I I. f

It is thus seen that the cam shaft 26 and the shaft 3!) are connected together by the rocker arms 2l and -28 'closely adjacent the plate Il and by the additional arms 45 and 46 spaced apart from the rocker varms 21 and 28 and that all of these arms 21, 28,45 and 46 are iiiiedly secured to the cam shaft 26 at their right-hand ends in Figures l' and 2 and are loosely or slidably pene trated by the shaft at their left-hand ends. if.:

The shaft '3o is free for movement in the slot it and it is clear that upward mov-ement of the shaft 3i) will tend to move the arms 21, 28, 45 and upwardly at their left-hand ends in Figures 1 and 2 and downward movement of the shaft 30 will move the arms 21, 28, 45 and 46 downwardly at their left-hand ends in Figure 2.

It should be noted that the slot IB is arcuate but that the center point of its arc is not the same as the center of the cam wheel 25 but is somewhat to the left thereof in Figure 2'.

Now, presuming the scotch block may' 'not have been tightly secured to the rail I2, whennthe wheel I4 of a car strikes the face portion I3 of the plate I I, the plate II will tend to slide tothe right in Figure 2, a slight distance, and this slide lng movement will pull the portion 38 tightly against the base 2U of the rail I2 and will pull the shaft 3U towards the bottom of the arcuate slot 5. The downward pressure of the shaft 30 will urge the left-hand ends Vof the rocker arms 21 and 28 downwardly, and, due to the off center relationof the cam shaft 2B and the cam 25, the righthand portions of the rocker arms 21 and 28 will move upwardly and to the left thus move ing the cam 25 in a counterclockwise direction in Figure 2 and pulling the clamping members 4e and 4I upwardly against the lower surface Aof the head I8 of the rail I2 and to tighten the block securely against the top of the rail I2 to prevent further sliding movement of the scotch block IU.

It is thus seen that the block I0 may be placed on a rail and the wedglng members 5I] and 5I driven into position by a suitable mallet to urge the clamping members 40 and 4I against each side of the rail.- The yoke member may be placed in position and the nuts 39 and 39 may be tightly secured to hold the block tightly against the rail. With the block thus seoiused.` there will be very 6 little sliding movement of the block, but any slid ing movement will tend to tighten the block against the rail rather than loosen it as has heroe toforebeeln the case.

It Should be noted that the arcuate Slot IS eX- tendsfupwardly and rearwardly so the yoke membei 35 may be secured tb th Shaft 30 Without removingv the block I0 from' the rail I2. This is accomplished by moving the shaft 3U upwardly inthe slot I5 to a point above the ends of the arms 3B' and 31 of the yoke 35 and then the shaft V30 is moved downwardly so the members 36 'and 31 will enterl the 'bores 3-I and y32 iii th shaft 30 after which the nuts 39 and 3'9" may-be driven home ,on the threaded portions of' the members 3B and'31. v i I l The length of the'slot I5 in the plate II and its curvature relative to the cam 25 provide for ease in mounting 'the scotch block I0 on the upper surface "of the rail I2 andalso for ease in removing the scotch block I0 `from the rail I2.

In removing the scotch block I0 from the rail I2, the nuts 39 and 39' are removed l'Il the upper ends of the threaded arms 3B and 31 of the yoke 35 and then the shaft 3U is moved upwardly along the slot I6 and, in so doing, the cam 25 is partially rotated in a clockwise direction in Figures 2 and 4. This partial rotation of 'the cani wheel 255 will move the shaft 26 downwardly', wmehwiu, in turn, move the nanges 42 and H of thel'clampingmembers 40 and 4I downwardly out' of engagement with the lower surfaces ofthe head I8 of the rail I2 and to where the members 4e and 4I may be moved outwardly, it being umy derstood that the members 5t and 5I must be moved to the dotted 'line position shown in Figure' 2 priorV to the members 4U and 4I being moved outwardly. -Since the head I8 of some rails is larger man others, the oversize bores 4t and 4I' in the members 4l)v and 4I permit the members 4D and 4I to be' swung outwardly so as to clear remotesurfac-es of the head I8 vof rail I2. The members 4Q and 4I may then be swung about the shaft 25', their flanges 42 and. 43 moving past the-'remote Surfaces of the head I8 `of the rail l2 and then' 'the ,scotch moet lo 'may be lifted oir' of the rail I2.

Now, when V,mounti'mr thescotch block` I0 on the rail MIZ, it is merely necessary to position the clamping members 4I! and 4I with their flanges above'theshaftvZ and then the shaft '39 is positioned at the highest point in the notch IS after which the cla'lripingr members 4U and 4I are swung downwardly and then moved inwardly to the positon shown in Figure 3. The shaft (fil is then moveddownwardly as the threaded Aarms 36 and 31 are inserted therein in the manner heretofore described,-to` thus olanipingly secure the' scotch block I2 to the upper surface of the rail I2.

Referring' howto Figures 6, '7 and 8, a modified form ofthe invention may beobserved wherein a modiiied form of yoke'member is used, the particular object of this modification being to prdvide a block which can be tightly secured to the top of the rail without the necessity of having an anchoring member disposed underneath the rail. With theV exception of the yoke member the parts are like those shown in Figures 1 to 5 inclusive, and like reference characters will be' used'fcr those parts.

The shaftv 39 is also the saine in both forms' 'of the invention and is lmounted in the plate II in a like manner. Pentratingthe bores Stand -32, inloppos'ed ends of ythe shaft 30 are bolts' Si and 62, respectively.' which are thiadd'a theirA upperends for recept-ion of the nuts 39 and 39. The lower portion of the bolts 6I and 62 penetrate opposed ends of a horizontally disposed plate member 63 which extends beneath the plate II. In this modified form of the invention the plate II has a notch 65 cut therein at its base portion which is loosely penetrated by the plate member 63. The plate member 63 is preferably of a thickness the same as, or slightly greater than, the depth of the notch 65 so that when the scotch block I is in position on the rail I2, the lower surface of the plate 63 will always be in engagement with the top surface of the head I8 of dthe rail I2 as at B6. It should be notedthat the notch 65 is somewhat Wider than the Width of the plate B3 so the plate 63 may have a limited amount of sliding movement in the notch 65 (Figure 8)'. A A

Now, when the scotch block Il! is placed on the rail I2 in the manner heretofore described. and the w-edging members 50 and 5I have -been driven home to secure the flanges 42 and 43 of the clamping members 4U and 4I against the rail I2, the nuts 39 and 39 are driven tightly against the shaft 30 to urge the shaft 3i) toward the bottom of the slot I6 and to thus urge the rocker arms 2'I and 28 downwardly at their left-- hand ends in Figure 6 and upwardly at their right-hand ends. This will cause the cam wheel to move in a counterclockwise direction to urge I the flanges 42 and 43 of the clamping members 40 and 4I tightly against the lower surface of the head I 8 of the rail I2 to prevent sliding movement of the scotch block I0 on the rail I2.

In this modification the nuts 39 and 39' should always be tightly secured against the rod However, in the event these nuts 39 and 35' should become loosened, or may not have been tightened suncientlmthe plate 63 will be in frictional engagement with the rail I2 and upon im- -i pact of a car wheel I4, the plate II will slide slightly relative to the plate 63 against the rail and will cause the shaft to move downwardly toward the lower portion of the slot I6 thus pulling the flanges 42 and 43 of the clamping members 4and 4I into tighter engagement with the lower surface of the head I8 of the rail I2 in the manner heretofore described.

In the drawings and specification there has been set forth a preferred embodiment of the invention, and although specific terms are employed, they are used in a generic and descriptive sense only, and not for purposes cf limitation, the scope of the invention being defined in the claims.

We claim:

1. In a wheel stop of the type adapted to be mounted upon a rail having a head flange and to slide a small amount thereon upon car wheel impact, bracket means slidably mounted in one portion of said stop and extending therebeneath in frictional contact with said rail, a cam rotatably mounted in another portion of said stop and spaced from said bracket, means, depending clamping means associated with said cam and supported thereby for clampingly engaging said rail, rocker arms connecting said bracket and said cam, whereby impact of a car wheel against said stop will move said bracket to actuate said cam through said arms thereby causing movement of said clamping means against said rail.

2. A scotch block of the type adapted to be mounted on a rail and being engageable by a car wheel for stopping movement of the same comprising a vertically disposed plate member having an arcuate slot, in the front portion thereof and having a circular bore in the rear portion thereof, the radius point of the arcuate slot being disposed below the center point of the circular bore, said plate having a curved surface at one edge conforming substantially to the curvature of a car wheel adapted to be engaged thereby, a cam oscillatably mounted in the circular bore, a cam shaft xedly mounted in the cam in oi center relation thereto remote from the arcuate slot, a transverse shaft loosely penetrating said arcuate slot, arms connecting the transverse shaft with the cam, at least one depending member oscillatably mounted on the cam shaft, said rail having'a head portion'integral therewith, means on the depending member adapted to engage the lower surface of thehead portion, and means on the plate for moving the transverse shaft downwardly toward the rail upon car wheel impact, whereby the movement of said transverse shaft downwardly will transmit partial rotation to the cam to cause the cam shaft to be moved upwardly or about the axis of the cam to thereby tighten the flange portion of the depending member against the lower surface of the head portion of the rail.

3. A scotch block adapted to be mounted upon a rail comprising a vertically disposed plate having a concave surface at its edge for engagement by a car wheel, a transverse shaft loosely penetrating the front portion of Said vertically disposed plate and having up and down movement in said plate, a cam rotatably mounted in the rear portion of said plate in spaced relation to said transverse shaft, an eccentrically positioned cam shaft penetrating said cam, said cam shaft being positioned rearwardly of the axis of the cam relative to the concave surface of the plate, arms connecting said transverse shaft with said cam shaft, depending members oscillatably connected to the cam shaft adjacent opposed sides of said vertically disposed plate, flanges on the proximate lower surfaces of the depending members and adjustable means secured to the transverse shaft and in frictional contact with the rail, said projections on the depending members being disposed a substantial distance below the lower surface of the vertically disposed plate, whereby impact of a car wheel against the curved surface of the vertically disposed plate will move said plate a small amount along the rail causing the adjustable means contacting said rail to be biased to pull the transverse shaft downwardly to transmit partial rotation to the cam wheel through the connection arms, thus causing the cam shaft to move upwardly to tighten the projections on the depending members against the lower surfaces of the head portion of the rail.

4. A wheel stop of the type adapted to be mounted upon a rail and to slide a small amount thereon under car wheel impact comprising a plate upstancling in the vertical plane of the rail, said plate having an arcuate slot in the front portion thereof, a horizontal shaft slidably disposed in said slot, a yoke member secured to the shaft and extending beneath the rail for securing the stop to the rail, a cam mounted in the rear portion of said stop, -depending clamping members associated with said cam, rocker arms connecting the shaft with the cam, whereby upon car wheel impact the yoke member will urge the shaft downwardly inthe arcuate slot and away from the center of the cam to cause the rocker arms to partially rotate the cam thereby urging the clamping members associated therewith into tight engagement with the rail to prevent movement of the stop on the rail.

5. A wheel stop of the type adapted toy be mounted upon a rail and to slide a short distance thereon under car wheel impact comprising a plate upstanding in the plane of the rail and having its forward end of concave formation to form an abutment for the car wheel, said plate having an arcuate slot in the front portion thereof, a horizontal shaft slidably disposed in said slot, bracket means secured to the shaft and extending beneath the rail for securing the stop to the rail, cam means rotatably mounted in the plate, a cam shaft penetrating said cam means, rail clamping means associated with said cam shaft, rocker arms connecting the horizontal shaft with the cam shaft, wedging means pivotally mounted at one end on said horizontal shaft and having notches in their other ends for engaging the cam shaft adjacent thev clamping means to thus urge the clampingy means against the rail, whereby upon car wheel impact the bracket will urge the horizontal shaft downwardly in the arcuate slot to cause the rocker arms to partially rotate the cam means elevating i.

said cam shaft to urge the clamping means associated therewith into tighter engagement with the rail to prevent movement of the stop on the rail.`

6. A scotch block of the type adapted to be mounted on a rail and to slide thereon slightly under car impact comprising a plate upstanding in the plane of the rail and having its forward end of concave formation to form an abutment for the car wheel, said plate having an arcuate slot in the front portion thereof, a horizontal shaft slidably disposed in said slot, bracket means removably secured to the Ashaft and extending beneath the rail for securing the block to the rail, said shaft being movable vertically in the arcuate slot so the bracket; may be removed from said shaft without removing the block from the rail, a cam shaft having a cam thereon rotatably mounted in the rear portion of the plate, clamping members depending from said cam shaft and having means thereon for engaging said rail, rocker arms connecting the first-named shaft with the cam shaft and cam thereon additional rocker arms. spaced aparty from the first-named arms and connecting the first-named shaft with the cam shaft, wedging means pivotally mounted at one end thereof on the first-named shaft and having notches in their other ends for engaging the cam shaft to thus urge the clamping means against the rail, whereby movement of the plate,

upon car wheel impact, will move the bracket means to urge the first-named shaft downwardly in the arcuate slot toward the rail causing the rocker arms to partially rotate the cam shaft to urge the clamping means into tighter engagement with the rail to prevent further movement of the block on the rail.

'7. A scotch block of the type adapted to be mounted on a rail and to slide slightly thereon under car impact comprising a plate upstanding in the plane of the rail and having its forward end of concave formation to form an abutment for the car wheel, said plate having a slot in the front portion thereof, a transverse shaft slidably mounted in said slot, a yoke removably secured to the shaft and extending beneath the rail for securing the block to the rail, a cam shaft, having a cam thereon rotatably mounted in the rear portion of the plate, clamping members depending from said cam shaft and having means thereon for engaging said rail, two spaced rocker arms on each side of the vertical plate secured at one of their ends to the first-named shaft and secured. at the other of their ends to the cam shaft and the cam means, said clamping means being disposed between said rocker arms, wedging means pivotally mounted at one end thereof on said. first-named shaft and having notches in their other ends for engaging the cam shaft to thus urge the clamping means associated therewith against the rail, said wedging members being beveled at their lower ends to tightly secure the clamping means on rails of different width, whereby upon car wheel impact, the yoke will urge the first-named shaft. downwardly in the slot towards the rail to ,"move the rocker arms to cause the cam to partially rotate and urge the clamping means into tighter engagement with the rail to prevent further movement of the block on the rail.

8. A scotch block having a car wheel abutment structure vertically disposed in the plane of a rail having a head thereon and said scotch block being adapted to slide slightly along the rail under impact of a car wheel comprising a vertical plate having an arcuate slot in the f'roni-I portion thereof, a horizontally disposed shaft loosely penetrating the arcuate slot, the shaft having bores therein at its opposed ends, a U-shaped member adapted to have its lower portion disposed underneath the rail and adjacent the base thereof and vertically extending portions adapted to penetrate the bores in each end of the shaft, the upper por--l tion of the vertically extending portions being threaded, nuts adapted to be secured to the upwardly extending portions for securing the same to the shaft, the vertical plate also having a bore in the rear portion thereof spaced from the arcu-f ate slot, a cam rotatably mounted in said bore, a cam shaft penetrating said cam and xedly secured thereto, rocker arms disposed on opposed sides of the vertical plate and xedly secured to the cam and the cam shaft; at one of their ends and slidably penetrated by the rst-named shaft at their other ends, a second pair of rocker arms disposed on opposed sidesV of the vertical plate and secured at one of their ends to the cam shaftk in spacedrelation to the first-named rocker arms and slidably penetrated at their other ends by the first-named shaft, depending clamping members oscillatably connected to the cam shaft on opposed sides of the vertical plate between the firstnamed and second-named rocker arms, flange portions on the lower proximate surfaces of the depending clamping members for engaging the rail, wedging members osciilatably mounted at one end thereof adjacent opposed sides of the vertical plate on the first-named shaft and having a notch in their other ends adapted to be fitted over the cam shaft, said wedging members being beveled on their lower surfaces, collar members on the firstnamed shaft adapted to hold thewedging members in spaced relation to the first-named rocker arms and adjacent the second rocker arms, whereby, upon the wedging members being driven home between the second rocker arms and the depending clamping members, the depending clamping members will be urged into tight engagement with the rail, and upon impact of a car wheel the vertical plate will move slightly pulling the first-named shaft downwardly in the arcuate slot, and to cause the rocker arms to partially rotate said cam to urge the depending clamping members upwardly into a tight clamping position against the lower surface of the head of the rail thus asaaovo preventing movement of the scotch block upon the rail.

9. A scotch block of the type adapted to be mounted on a rail to prevent movement of a car wheel thereon comprising a plate upstanding in the plane of the rail and having its forward end of concave formation to form an abutment for the car wheel, said plate having a slot in the front portion thereof, a shaft slidably disposed in said slot, a yoke removably secured to the shaft and having a lower portion extending beneath the plate in contact with the upper surface of the rail, said plate having a notch in its lower surface for the reception of the lower portion of the yoke, said notch being of the same depth as the thickness of the lower portion of the yoke but being slightly longer than the width of the lower portion of the yoke so the lower portion of the yoke will engage the upper surface of the rail and will have limited sliding movement in the notch, a cam shaft having a cam thereon rotatably mounted in the rear portion of the vertical plate, two spaced rocker arms positioned on each side of the vertical plate and secured at one of their ends to the first-named shaft and at their other ends to the cam shaft and cam means, rail clamping members depending from said cam shaft between said rocker arms, wedging means pivotally mounted at one end thereof on said first-named shaft and having notches in their other ends for engaging the cam shaft to thus urge the clamping means associated therewith against the rail, whereby upon wheel impact frictional contact of yoke against the rail will urge the shaft downwardly in the slot to cause the rocker arms to partially rotate the cam shaft to urge the clamping means associated therewith into tighter engagement with the rail to further tighten the block against the rail.

10. A scotch block adapted to be mounted on a, railroad rail provided with upper and lower flanges comprising a transverse member adapted to rest on the upper surface of the upper flange of the rail and having threaded bolts slidably penetrating the same and extending upwardly therefrom, a transversely disposed shaft loosely penetrated by said bolts, said bolts having nuts on the upper ends thereof, a vertically disposed plate resting on the upper flange of the rail and having a notch in its lower surface fitting over the transverse member, said vertically disposed plate having an arcuate slot in the front portion thereof penetrated by said transversely disposed shaft, rocker arms disposed one on each side of the vertically disposed plate and having one of their ends oscillatably mounted on the transversely disposed shaft, said vertically disposed plate having a circular cavity in the rear portion thereof. a' 'second transversely disposed shaft penetrating said circular cavity and having a circular cam eccentrically secured thereon, said circular cam loosely fitting in said circular cavity in the vertically disposed plate, the other ends of said rocker arms being fixedly secured to said second transversely disposed shaft, a downwardly depending member loosely mounted on said second transversely disposed shaft on opposed sides of the vertically disposed plate, said downwardly depending members each being provided with an inwardly disposed fiange adapted to fit beneath the top fiange of the rail, a second rocker arm disposed on each side of the vertically disposed plate and in spaced relation to the first rocker arms. and having one of their ends oscillatably secured to the first transversely disposed shaft and having their other ends xedly secured to the second transversely disposed shaft, wedging members disposed between each of the outermost rocker arms and the depending members, said wedging members being oscillatably mounted on the first transversely disposed shaft, said wedging members each having a notch in its lower surface adapted to fit over the second transversely disposed shaft and each of the wedging members having beveled lower portions adjacent the notches to provide an entering surface between the outermost rocker arms and the adjacent depending members so that when the wedging members are driven between the rocker arms and the downwardly depending members, the downwardly depending members will have their free ends moved inwardly forcing the inturned flanges on the downwardly depending members against the sides of the rail, whereby upon car wheel impact said transverse member will actuate said cam through said rocker'arms to urge said downwardly depending members into tighter engagement with said rail.

JOHN C. DOCKERY. NICHOLAS W. DOCKERY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,629,669 Lippis et al May 24, 1927 2,235,994 Hayes Mar. 25, 1941 

